Your interest in a specialty area like corrosion engineering is unusual for someone still in high school. One of the most common applications for corrosion engineers is water corrosion. That would place you within the very important Field of Water Resources. I have spent 40 years in the Water Resources Field and I can assure you that this field is even more necessary and challenging today than when I joined it in the 1970s. A Civil Engineering degree is the Gateway to this Field. For a specialty like Water Corrosion, you could expect to do a Masters Degree. I encourage you to enter this worthwhile Field where the demand continues to grow.
Pete Sturtevant, PE